DHCPv6 Script for automatic AFTR domain retrieval on MikroTik RouterOS

This repository contains a script that enables automatic downloading and setting of the CG-NAT AFTR domain in an IPIPv6 tunnel based on information received from the operator's DHCPv6 server.

Installation

Installing the script on your system is very simple.

1. First, prepare all the necessary interfaces: PPPoE client/DHCPv6 client and IPIPv6 tunnel.

2. Configure the DHCPv6 client according to your operator's recommendations. Most often, you need to set Request to prefix

3. In the Client Options tab in the DHCPv6 Client section, create a new option with the following parameters:

• Name: OPTION_AFTR_NAME_REQ
• Code: 6
• Value: 0x0040

4. In the created DHCPv6 client, go to the Advanced tab and add the previously created option in the DHCP Options field.

5. In the script field, paste the script from this repository. Change the tunnelName, fallbackAFTR and AFTRDNSServer variables according to your preferences.

6. Save the changes. From now on, you should have dynamic retrieval of the AFTR router domain from your operator.

If you don't know what to enter in fallbackAFTR, simply delete the entire section related to fallback and set the AFTR domain blindly. It exists because, in the case of my operator, the assigned AFTR router stopped working for a few hours, and since my operator's AFTR domains are known, I decided to add a fallback to a router from another city. :P